Nilsen, E. T. 1987. Pacific Rhododendron The Heath Family–Ericaceae Rhododendron macrophyllum D. Don ex G. Don (roe-doe-DEN-dron mak-row-FILL-um) Names: The Pacific Rhododendron is also known as the Coast Rhododendron, California Rhododendron, or California Rosebay. Facts. Facts. It can grow from 3.9 inches to 98 feet in height, depending on the variety. Rosebay.org If you want to learn more about the various activities within the American Rhododendron Society Massachusetts Chapter visit our chapter activity pages. 'Roseum Bluestem' gets its name from the reddish stems, and is a selection by Rarefind Nursery of Jackson, NJ. There are more than 1000 species of rhododendron that are native to Europe, Asia, North America and Australia. If mechanical removal is attempted in the case of forest management, extremely high densities are attained by this species in a matter of a few years. The leaves are large, leathery, and evergreen, similar to Catawba Rhododendron but narrower. Rhododendron flowers are as interesting as they are beautiful. Rosebay Rhododendron ... Rhododendron is an evergreen understory shrub that grows to about 30 feet. Catawba Rhododendron is a multi-trunked large shrub or small tree that grows on steep north-facing slopes in the Piedmont of North Carolina. native to Ohio (R. calendulaceum, R. periclymenoides and R. prinophyllum) but none have as thick or leathery leaves as the rosebay.Larger shrubs of age exhibit a very aesthetically pleasing layering of the branches which help keep this shrub's beauty a year-round thing. Rosebay rhododendron is a slow-growing shrub and has a very high sprout potential. Providing a stunning floral show, Rhododendron catawbiense (Catawba Rosebay) is a large, oval-rounded, broadleaf evergreen shrub boasting large rounded clusters of lilac-purple flowers. Interesting Rhododendron Facts: Rhododendron grows in the form of bush or small tree. Rosebay Rhododendron is a highly useful shade shrub - It is one of the most shade-tolerant shrubs in North America. Rosebay rhododendron is the most frequently occurring and dominant species of Rhododendron in the southern Appalachian region, and occurs occasionally on mesic hill-slopes throughout the upper Piedmont Crescent of the Southeastern United States. Mature height depends on climate and varies from 3 feet (1 m) in the colder northeast to 40 feet in the southeast [66,106]. Use Rosebay as a backdrop for a shade garden, or as a screen for a shady yard. Catawba rhododendron is a large-leaved, evergreen shrub reaching 6 to 10 feet high with large, lilac-purple flowers borne in clusters (trusses) in mid-to late spring. The hardy catawba hybrids are derived from R. catawbiense and allied species. The pollen of many if not all species of rhododendrons is also probably toxic, being said to cause intoxication when eaten in large quantities[183]. Expand. Flowers bloom in umbel-like inflorescences from June to August. In New England, it reaches the southern edge of its boreal range in northern New Hampshire and Maine, where it is considered rare. Rhododendrons are native chiefly in the North Temperate Zone, Not as hardy as Catawba rhododendron; needs some sun and wind protection. A fantastic plant with an incredibly long season of bloom. University of Connecticut, Recommended Tree, Shrub, and Woody Vine Identification Guides. While most rhododendrons have five petals, this species typically has seven. Rosebay Rhododendron is a spectacular native to shaded, hillier spots in our area and differs from the large leaf Rhododendron that we are used to by its size, habit and time of bloom. 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